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Finding the Fourth Proportional to 121,109.60, 181,696.80 and 86,117.60

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Solution

The fourth proportional to 121,109.60, 181,696.80 and 86,117.60 is: 129,199.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,109.60 : 181,696.80 = 86,117.60 : x
  2. Step 2: Convert to fraction form
    121,109.60/181,696.80 = 86,117.60/x
  3. Step 3: Cross multiply
    121,109.60x = 181,696.80 × 86,117.60
  4. Step 4: Simplify right side
    121,109.60x = 15,647,292,343.68
  5. Step 5: Solve for x
    x = 15,647,292,343.68/121,109.60
  6. Step 6: Final answer
    x = 129,199.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.